Prepends // @ts-nocheck to the top of all .js, .jsx, .ts and .tsx files in a given directory. Will not add one if one already exists.
$ npx ts-nocheck .ts-nocheck [options] dir
Options configuration:
--js-off Disable adding nocheck to js files
--jsx-off Disable adding nocheck to jsx files
--ts-off Disable adding nocheck to ts files
--tsx-off Disable adding nocheck to tsx files
--smart-check-off Add nocheck to all js, jsx, ts, tsx files even if it already has one
Changing the file extension of all your .js/.jsx files to .ts/.tsx at once at the start of your migration comes with the benefit of much more readable Git diffs in the future. For example, if a file is renamed (aka extension changed) and then enough file changes are made, Git will list this as two seperate files, a file deletion (JS file) + a brand new file (TS file). This makes the diffs hard to compare.
However, changing all file extensions to .ts/.tsx at once obviously prevents you from compiling until types for all files are added. Adding // @ts-nocheck to the top of all your files can help ease the pain of a JS to TS migration.
Pairs well with tools such as js-to-tsx.